Peritoneal recurrence in serosa-negative gastric adenocarcinoma after curative surgery.

BACKGROUND/AIMS: The rate of recurrence increases in proportion to the degree of tumor depth, even after curative resection for gastric adenocarcinoma. Serosal exposure is considered as an important risk factor of peritoneal recurrence. However, some patients with serosa-negative cancer were found to have peritoneal recurrence. There are few reports concerning risk factors of peritoneal recurrence in serosa-negative gastric adenocarcinoma. The aim of this study is to evaluate the incidence and risk factors of peritoneal recurrence in serosa-negative gastric adenocarcinoma after curative resection. METHODOLOGY: Total 1128 serosa-negative gastric cancer patients (574 pT1, 251 pT2, 303 pT3) diagnosed as gastric adenocarcinoma that underwent R0 resection from 1988 to 2005 were enrolled. RESULTS: Peritoneal recurrence was observed in 50 (4.4%) patients, including 3 pT1, 3 pT2 and 44 pT3 patients. The incidence of peritoneal recurrence increased significantly with tumor invading subserosa (pT3). Multivariate analysis showed that the independent risk factor of peritoneal recurrence was tumor depth. CONCLUSIONS: The incidence of peritoneal recurrence in serosa-negative cancer is low, and tumor depth is a significant risk factor. We should be aware of peritoneal recurrence during follow-up, especially for patients with subserosal tumor invasion.

Factors associated with recurrence within 2 years after curative surgery for gastric adenocarcinoma.

BACKGROUND: Despite curative surgery for gastric cancer, many patients die of recurrent cancer. Few studies have investigated the time to recurrence after curative resection for gastric cancer. METHODS: Data were collected prospectively between December 1987 and December 2006. A total of 1,549 patients underwent curative resection of adenocarcinoma of the stomach at Taipei Veterans General Hospital. Among them, 419 patients had recurrence; they were divided into early recurrence (<2 years) and late recurrence (≥2 years). The clinicopathological characteristics, survival time after recurrence, and recurrence patterns were compared between the two groups. RESULTS: Multivariate analysis showed that stage III gastric cancer patients with early recurrence had larger tumors and more lymph node metastasis than patients with late recurrence, while no difference between early and late recurrence was observed in stage I and II patients. Early recurrence was associated with more distant metastasis than was late recurrence. Patients with advanced TNM stage tended to die within 2 years after recurrence. CONCLUSIONS: Gastric cancer patients with larger tumors and more lymph node metastasis tended to have early recurrence, especially stage III patients. Advanced TNM stage was associated with early cancer death after recurrence.

Comparison of the survival difference between AJCC 6th and 7th editions for gastric cancer patients.

BACKGROUND: The AJCC 7th edition changes the classification of T- and N-factors and the TNM stage of gastric cancer. We evaluated its prognostic impact. METHODS: From December 1987 to December 2006, a total of 1,380 patients underwent curative surgery for gastric cancer at the Department of Surgery, Taipei Veterans General Hospital, with a retrieved lymph node number ≥ 15. Survival was compared for disease classified according to the AJCC 6th and 7th editions. RESULTS: There is a significant difference in 5-year survival between T2 and T3 gastric cancer classified according to the AJCC 7th edition (75.2 vs. 54.9%, p < 0.001), as well as between N1 and N2 (71.4 vs. 44.1%, p < 0.001). Although patients with N3a had a better 5-year survival than did those with N3b (27.6 vs. 11.3%, p < 0.001), the N3 categories were combined and not applied in the TNM stage in the 7th edition. Multivariate analysis using Cox's proportional hazards model with a forward logistics regression stepwise procedure demonstrates that age, N category of 6th edition, and T and N categories of 7th edition are independent prognostic factors; however, T category of 6th edition is no longer significant. Furthermore, the discriminative power of survival difference between each TNM stage seems to be comparable between the 6th and 7th editions. CONCLUSIONS: The AJCC 7th edition provides a more stratified survival difference in staging of gastric cancer. Future division of N3a and N3b in the classification of the TNM stage is recommended.

Risk factors and management of anastomotic leakage after radical gastrectomy for gastric cancer.

BACKGROUND/AIMS: Radical gastrectomy remains the primary treatment for gastric cancer without distant metastasis. However, anastomotic leakage and extended lymph node dissection might cause additional morbidity and related mortality. METHODOLOGY: From January 1988 to December 2004, 2076 patients with gastric cancer underwent radical gastrectomy at Taipei Veterans General Hospital. The risk factors for anastomotic leakage, including clinicopathological factors, operative procedures, combined organ resection, operating time, blood loss, and associated disease, were analyzed. The various methods used to measure anastomotic leakage and the clinical courses of different sites of anastomotic leakage were compared. RESULTS: The overall complication rate was 18.7% and the incidence of anastomotic leakage was 2.7% (n=57). The anastomotic leakage-related mortality rate was 21.1% (n=12). Older age (> or =65 years), longer operating time, more blood loss, and co-morbidities were the precipitating factors. Adequate drainage was the treatment approach used for anastomotic leakage. The incidence of anastomotic leakage was reduced during the later period of the study (3.4% vs. 1.8%). CONCLUSION: Only in an institute with a well-established training program and high volume of gastric cancer patients can we improve the surgical skills and accumulate the experiences with management of anastomotic leakage that make radical gastrectomy safer.

Mucin-producing gastric cancer: clinicopathological difference between signet ring cell carcinoma and mucinous carcinoma.

BACKGROUND/AIMS: Signet ring cell carcinoma and mucinous carcinoma are mucin-producing gastric cancers. Their clinicopathological difference was obscure. METHODOLOGY: From December 1987 to July 2005, a total of 1612 gastric cancer patients received curative surgery, 128 patients with signet ring cell carcinoma and 48 with mucinous carcinoma were enrolled in this study. Clinicopathological data were compared between the two groups. RESULTS: Early stage (stage I and II) patients with mucinous carcinoma were associated with more male predominant (p = 0.002), larger tumor size (p = 0.020), deeper cancer invasion (p < 0.001), and a worse 5-year overall survival (63.6% vs 88.2%, p = 0.012) than those with signet ring cell carcinoma. There was no significant difference between the two groups with advanced stage in 5-year overall survival. There is no significant difference in the initial recurrence pattern between the two groups. CONCLUSIONS: Patients with mucinous carcinoma had different biological behaviors with those with signet ring cell carcinoma, in particular early stage, hence had a worse survival.

Esophagogastric junction adenocarcinoma according to Siewert classification in Taiwan.

BACKGROUND: The incidence of adenocarcinoma of the esophagogastric junction (AEG) is rapidly increasing. We evaluated the clinicopathological difference and outcomes of Taiwanese patients with AEG according to the Siewert classification. METHODS: Data were prospectively collected between December 1987 and July 2007. Two hundred thirty-one patients underwent curative resection of AEG at Taipei Veterans General Hospital and were divided into different Siewert types. The clinicopathological characteristics, operative morbidity, survival, and initial recurrence pattern were compared between the different types. RESULTS: Fifty-one type II and 180 type III cancer patients were studied. Subtotal esophagectomy via a left thoracotomy (19.6% vs 2.8%), smaller tumor size (4.43 +/- 2.04 vs. 5.35 +/- 2.03 cm), and more combined organ resection (60% vs. 43.1%) were more common in type II than type III cancer. Multivariate analysis showed that three independent risk factors for death were gender, tumor size, and lymphovascular invasion. There were long-term survivors among the patients with lesser curvature site lymph node metastasis, whereas metastasis to the lymph nodes of the distal stomach and along the greater curvature site was associated with poor prognosis. The 5-year survival was similar between type II and type III cancer (59.6% vs. 63.5%, P = 0.947). CONCLUSIONS: Lymphovascular invasion, tumor size, and gender were determined to be three independent factors of survival after curative resection for AEG, and Siewert type was not associated with differences in survival.